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## org.apache.catalina.realm
Class MemoryRealm

    java.lang.Object
      org.apache.catalina.realm.RealmBase
          org.apache.catalina.realm.MemoryRealm

All Implemented Interfaces:
  Lifecycle, javax.management.MBeanRegistration, Realm

Direct Known Subclasses:
  JAASMemoryLoginModule

public class MemoryRealm
extends RealmBase

Simple implementation of Realm that reads an XML file to configure the valid users, passwords, and roles. The file format (and default file location) are identical to those currently supported by Tomcat 3.X.

IMPLEMENTATION NOTE: It is assumed that the in-memory collection representing our defined users (and their roles) is initialized at application startup and never modified again. Therefore, no thread synchronization is performed around accesses to the principals collection.

Version:
  $Revision: 1.4.2.1 $ $Date: 2004/11/17 17:07:20 $
Author:
  Craig R. McClanahan

Field Summary
`protected java.lang.String` | `info` Descriptive information about this Realm implementation.
`protected static java.lang.String` | `name` Descriptive information about this Realm implementation.

Fields inherited from class org.apache.catalina.realm.RealmBase
`controller, debug, digest, digestEncoding, domain, host, initialized, lifecycle, md, md5Encoder, md5Helper, mserver, oname, path, support, type, validate`

Fields inherited from interface org.apache.catalina.Lifecycle
`AFTER_START_EVENT, AFTER_STOP_EVENT, BEFORE_START_EVENT, BEFORE_STOP_EVENT, START_EVENT, STOP_EVENT`

Constructor Summary
`MemoryRealm()`

Method Summary
`java.security.Principal` | `authenticate(java.lang.String username, java.lang.String credentials)` Return the Principal associated with the specified username and credentials, if there is one; otherwise return `null`.
`protected org.apache.commons.digester.Digester` | `getDigester()` Return a configured `Digester` to use for processing the XML input file, creating a new one if necessary.
`java.lang.String` | `getInfo()` Return descriptive information about this Realm implementation and the corresponding version number, in the format `<description>/<version>`.
`protected java.lang.String` | `getName()` Return a short name for this Realm implementation.
`protected java.lang.String` | `getPassword(java.lang.String username)` Return the password associated with the given principal's user name.
`java.lang.String` | `getPathname()` Return the pathname of our XML file containing user definitions.
`protected java.security.Principal` | `getPrincipal(java.lang.String username)` Return the Principal associated with the given user name.
`protected java.util.Map` | `getPrincipals()` Returns the collection of valid principals for this realm.
`void` | `setPathname(java.lang.String pathname)` Set the pathname of our XML file containing user definitions.
`void` | `start()` Prepare for active use of the public methods of this Component.
`void` | `stop()` Gracefully shut down active use of the public methods of this Component.

Methods inherited from class org.apache.catalina.realm.RealmBase
`addLifecycleListener, addPropertyChangeListener, authenticate, authenticate, authenticate, destroy, digest, Digest, findLifecycleListeners, findSecurityConstraints, getContainer, getController, getDebug, getDigest, getDigest, getDigestEncoding, getDomain, getObjectName, getType, getValidate, hasMessageDigest, hasResourcePermission, hasRole, hasUserDataPermission, init, log, log, main, postDeregister, postRegister, preDeregister, preRegister, removeLifecycleListener, removePropertyChangeListener, setContainer, setController, setDebug, setDigest, setDigestEncoding, setValidate`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### info

    protected final java.lang.String info

  Descriptive information about this Realm implementation.

  See Also:
    Constant Field Values

### name

    protected static final java.lang.String name

  Descriptive information about this Realm implementation.

  See Also:
    Constant Field Values

Constructor Detail

### MemoryRealm

    public MemoryRealm()

Method Detail

### getInfo

    public java.lang.String getInfo()

  Return descriptive information about this Realm implementation and the corresponding version number, in the format `<description>/<version>`.

  Specified by:
    `getInfo` in interface `Realm`
  Overrides:
    `getInfo` in class `RealmBase`

### getPathname

    public java.lang.String getPathname()

  Return the pathname of our XML file containing user definitions.

### setPathname

    public void setPathname(java.lang.String pathname)

  Set the pathname of our XML file containing user definitions. If a relative pathname is specified, it is resolved against "catalina.base".

  Parameters:
    `pathname` - The new pathname

### authenticate

    public java.security.Principal authenticate(java.lang.String username,
                                                java.lang.String credentials)

  Return the Principal associated with the specified username and credentials, if there is one; otherwise return `null`.

  Specified by:
    `authenticate` in interface `Realm`
  Overrides:
    `authenticate` in class `RealmBase`
  Parameters:
    `username` - Username of the Principal to look up
    `credentials` - Password or other credentials to use in authenticating this username

### getDigester

    protected org.apache.commons.digester.Digester getDigester()

  Return a configured `Digester` to use for processing the XML input file, creating a new one if necessary.

### getName

    protected java.lang.String getName()

  Return a short name for this Realm implementation.

  Specified by:
    `getName` in class `RealmBase`

### getPassword

    protected java.lang.String getPassword(java.lang.String username)

  Return the password associated with the given principal's user name.

  Specified by:
    `getPassword` in class `RealmBase`

### getPrincipal

    protected java.security.Principal getPrincipal(java.lang.String username)

  Return the Principal associated with the given user name.

  Specified by:
    `getPrincipal` in class `RealmBase`

### getPrincipals

    protected java.util.Map getPrincipals()

  Returns the collection of valid principals for this realm. The keys to the map are Strings, the user names.

  Returns:
    The principals

### start

    public void start()
               throws LifecycleException

  Prepare for active use of the public methods of this Component.

  Specified by:
    `start` in interface `Lifecycle`
  Overrides:
    `start` in class `RealmBase`
  Throws:
    `LifecycleException` - if this component detects a fatal error that prevents it from being started

### stop

    public void stop()
              throws LifecycleException

  Gracefully shut down active use of the public methods of this Component.

  Specified by:
    `stop` in interface `Lifecycle`
  Overrides:
    `stop` in class `RealmBase`
  Throws:
    `LifecycleException` - if this component detects a fatal error that needs to be reported

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